BIOS 105 Chapter 40 - a. keep the internal physiological environment ...

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BIOS 105 Chapter 40

• The mechanisms of homeostasis
• keep the internal physiological environment relatively constant regardless of external

changes.

• keep vital organs working at their maximum potential.
• keep all cells working at the same metabolic rate.
• keep the body's metabolic rate constant in varying environmental tempera- tures.
• keep the body's temperature constant in varying environmental tempera- tures.:

Answer a

• Most of the water in the body is found
• in the interstices between cells.
• intracellularly.
• in the plasma.
• in the digestive tract.

e. as cerebrospinal fluid that cushions nerves.:

Answer b

• Homeostasis refers to the tendency to keep body systems
• matched to the external environment.
• the same relative to one another.
• in a steady state over time.
• under the control of the brain.

e. at the same specific temperature.:

Answer c

• A mouse has been eating your supply of snacks, so you set a trap and wait to hear the "snap!"

indicating that it has been caught. Your ears are providing

• an error signal.
• feedback.
• positive feedback.
• feedforward information.

e. homeostasis.:

Answer b

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• In regulatory systems, negative feedback
• is the least common type of feedback mechanism.
• stimulates a return toward the set point.
• amplifies a response.
• disrupts homeostasis.

e. None of the above:

Answer B

• Which of the following statements about positive feedback is false?
• It is more commonly observed than negative feedback.
• It tends to reach a limit and terminate rapidly.
• It amplifies a response.
• Contractions of the uterus are an example of positive feedback.

e. Sexual behavior is an example of positive feedback.:

Answer A

• Positive feedback responses
• are long-term, stable influences in the body.
• can increase or decrease the deviation from a set point.
• are more common than negative feedback responses.
• tend to reach a limit and then terminate.

e. cause physiological parameters to cycle above and below a set point.:

Answer d

• Which of the following would serve to change the set point of a regulatory system?
• Negative feedback
• Positive feedback
• Feedforward information
• Insensitivity to information

e. None of the above:

Answer C

• Suppose an airline pilot sets an aircraft's engines to produce a velocity of 450 mph, and

measures that speed using an instrument on the outside of the plane. When another pilot reports turbulence ahead, the pilot changes the velocity set point to 350 mph. The other pilot is providing

• an error signal.
• negative feedback. 2 / 3

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• positive feedback.
• feedforward information.

e. homeostasis.:

Answer d

• You wait patiently for your favorite band to take the stage. When you hear the crowd

begin cheering, you notice that the drummer has slid into his seat. The crowd has provided you with

• an error signal.
• negative feedback.
• positive feedback.
• feedforward information.

e. homeostasis.:

Answer d

• As fruits ripen they emit a chemical called ethylene, which attracts several fruit flies. The

fruit flies damage the fruit, causing more odor to be released, which attracts more flies, which results in attracting still more flies.This is an example of

• an error signal.
• negative feedback.
• positive feedback.

• feedforward information.

e. homeostasis.:

Answer c

• Suppose an airline pilot sets an aircraft's engines to produce a velocity of 450 mph, and

measures that speed using an instrument on the outside of the plane. When another pilot reports turbulence ahead, the pilot changes the velocity set point to 350 mph. The instrument on the outside of the plane is providing

• an error signal.
• a set point.
• an effector.
• feedback.

e. homeostasis.:

Answer d

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